AT32F421 Series Reference Manual
2022.11.11 Page 33 Rev 2.02
1.2 List of abbreviations for registers
Table 1-4 List of abbreviations for registers
Software can read and write to this bit.
Software can only read this bit.
Software can only write to the bit. Reading it returns its reset value.
Software can read this bit. Reading this bit automatically clears it.
Software can read this bit and clear it by writing 0. Writing 1 has no effect on this bit.
Software can read this bit and clear it by writing 1. Writing 0 has no effect on this bit.
Software can read this bit and set it by writing 1. Writing 0 has no effect on this bit.
Software can read this bit and toggle it by writing 1. Writing 0 has no effect on this bit.
Software can read this bit. Writing any value will trigger an event.
1.3 Device characteristics information
Table 1-5 List of abbreviations for registers
1.3.1 Flash memory size register
This register contains the information about Flash memory size.
Flash size, in terms of KByte
For example: 0x0040 = 64 KByte
1.3.2 Device electronic signature
The device electronic signature contains the memory size and the unique device ID (96 bits). It is stored
in the information block of the Flash memory. The 96-bit ID is unique for any device, and cannot be
altered by users. It can be used for the following purposes:
Serial number: such as USB string serial number
Part of security keys
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